We looked at the various efforts so far at creating polling systems on Hive. And then we decided to work on an open protocol which nobody owns and has nobody's brand, and could be easily implemented by all frontends.
Another aspect of this is that for more substantial governance voting, a full post would allow for presenting with more elaboration the matter being voted on. The post is also integrated with the communities functionalities. It allows for more structured commenting underneath the post. And so on.